Pencil



June 16, 1925.

H. s. HASSELQUIST PENCIL Filed Juno 4, 1921 hold the same against slipping.

Patented June 16, 1925.

UNITED PATENT OFFICE;

HUGO S. HASSELQUIST, OI C HICAGOQILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENT S, TO AUTOPOIN'I' MANUFACTURING COMPANY, OF- CHICAGO, ILLINOIS, A CORPORA- TION or ILLINOIS.

Appllcatiqn filed June 4,

To all whom it may concern:

Be it known that I, Huoo S. HASSEDQUIST, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have inventedcertain new and useful Improvements in Pencils,of which thefollowing is a specification.

This invention relates to a pencil in which is slidably held'a lead that is adapted to be advanced into writing position by means of any suitable propelling device; more particularly it is concerned with certain improvements in the pencil tip which is formed to engage frictionally with the lead so as to pencils, such, for instance, as those disclosed in the Keeran Patent No. 1,372,354 granted March 22, 1921, the requirements of dimensions, -materials, etc., impose'certain conditions which present special difliculties. Among the various parts which commonly prove troublesome is the pencil tip which engages the lead by exerting thereon a spring pressure of a kind and degree to afford proper support to the lead. According to the present construction, the tip; avoids marring or splitting the lead and is formed to present a desirable area of bearing surface to the lead in a manner which will reduce to a minimum the likelihood of its breakage.

In the accompanying drawing an embodiment of my pencil tip'is shown in the manner following:

Figure 1 is a longitudinal section through the lower end of a pencil equipped with my friction tip;

Fig. 2 is an end In the manufacture of lead elevation thereof, the lead I being shown in cross section;

.. which is arrangeda guide lead C, the lower end 6 of Fig. 3 is an enlarged fragmentary elevation of the lower end of the tip, as it appears when the slits are first formed;

Fig. 4.- is a similar View showing the slits after being closed; and

Fig. 5 is a similar view showing the tip expanded as when a lead is held therein.

Referring to Fig. 1, I have shown the lower or pointed end A of a pencil within tube B for the the tube being PENCIL.

1921. Serial m5. 474,948.

metal which is produced from a suitable spring material. Preferably the outer walls of the tip are tapered to align and lie flush with those of the pencil body, as shown.

There ,is formed within the tip a chamber, 7 Jwhich extends from below the tube en for perhaps half its remaining length, ,and also a cylindrical bore 8 which proceeds from the chamber through to the tip ex-. tremity. As shown in Fig. '1, the walls surrounding the tip bore taper outwardly slightly commencing with a point 9 about midway of the length of the bore so as to recede thereabove as at 10 from the lead C that is projected therethrough. From this it results that the lead is enga ed only throughout the lower portion 0? the tip whose walls are adapted to exert a spring pressure againstthe lead. Radial slits 11,.

the chamber 7. By forming slits such asthese, three spring sections a, b, and 0 are provided (see Fig. 2), each of which frictionally engages the lead throughout a substantial portion of its length.

In the formation of these slits, it is most convenient to use rotary saws havin a thickness of perhaps .010". As these slits, so formed, are considerably wider than necessary, the tip is swedged so as to force together its several spring sections,'thereby closing the slits, as shown in Fig. 4, so that no discernible gaps exist. In this condition a lead of perhaps .0465 diameter is projected through the tip whose internal diameter below thepoint 9 is very slightly less; When the lead is so introduced, the several tip sections will be slightly expanded to permit a relationing of the parts as shown in Figs. 1 and 5. It will be noted in the former figure that the lead is engaged by each section of the tip throughout that portion of its len th which lies below the point 9/ This a ords a bearing surface of appreciable length suoh that the'resulting pressure upon the lead will be distributed over a considerable area.

I claim:

Ina pencil, the tip portion having an axial bore, the extremityof the tip portion being" slitted to provide resilient sections, the bore at the slitted portion being slightly tapered in the absence of the lead and the by the insertion of a. lead so that the bore at the slitted portion is substantially cylindrical and bears against the lead throughout substantially the entire area of the slitted portion.

HUGO S. HASSELQUIST.

Witness:

.E. L. CAMPBELL. 

